So I understand that: Protons= 2 up quarks and a down quark... and Neutrons= an up quark and 2 down quarks... and Electrons are not made of quarks (so small!) So my questions are: 1.) According the Heisenberg Uncertainty Principle, we don't know how many strings (according to string theory) make up electrons, correct? Please, someone, candor is appreciated if I'm wrong. 2.) And how many strings make up a proton, a neutron, an up quark, and a down quark? I would imagine that if the number of strings making a an up quark were represented by U and the number of strings making up a down quark were represented by D then the formulas for strings in protons and neutrons would look like... P=2U+D N=2D+U Sorry; these questions are rudimentary, and if the amount of quarks making up neutrons and protons are unknown, then I'll feel like quite a fool for asking this.